Because he was a very borderline case, he wasn't particularly well-liked by peers and the media of his time, and HOF voters get off on being withholding. Also, the pool of voters changed over time. The people who voted him in this time aren't necessarily the same people who voted him out last time, are they? Members of the "Golden Era Committee" are still members of the hall, right? I know this was recently restructured but honestly don't know the details. The Golden Era Committee was made up of Hall of Famers Hank Aaron, Al Kaline, Ralph Kiner, Tommy Lasorda, Juan Marichal, Brooks Robinson, Don Sutton, and Billy Williams. Major league executives Paul Beeston, Bill DeWitt, Roland Hemond, Gene Michael, and Al Rosen are also on the committee along with three media members Dick Kaegel, Jack O'Connell and Dave Van Dyck.